Heres the problem with your example heh

We're UTG and we 4xbb (36bb left in stack)
villain calls from BTN, 9x in pot (SB got raked off)
We pot, our 9x and so we have 27 left and 18 in pot. We shove our 27 into 18.




(i dont know why I didnt put in 15% but did put 5, 10, and 20 in the chart. Oversight I guess)

further, I dont trust my charts to be deadly accurate. I really need to redo them. But the math isnt particularly hard to do by hand.